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Information recording and reproducing apparatus, and information recording and erasing method

a technology of information recording and reproducing apparatus, which is applied in the direction of digital signal error detection/correction, instruments, recording signal processing, etc., can solve the problems of erasing recording data, making the restoring data unreadable, and the original recording data cannot be restored without the restoring data. , to achieve the effect of short tim

Inactive Publication Date: 2005-01-20
PIONEER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] The present invention has been achieved in order to solve the above problems. It is an object of this invention to make it possible to erase, in a short time, data which is recorded on a recording medium, particularly of additionally-recordable type recording medium capable of recording information only once, in a manner completely unreadable.

Problems solved by technology

The processed data can be generated by various data processes such that original recording data cannot be restored without the restoring data.
When the recording data which is recorded by the above method is erased, the information recording and reproducing apparatus makes the restoring data unreadable.
Therefore, since performing the process of making only a portion of the restoring data unreadable is enough even for a comparatively large quantity of the recording data, erasing the recording data is possible in a short time.

Method used

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  • Information recording and reproducing apparatus, and information recording and erasing method
  • Information recording and reproducing apparatus, and information recording and erasing method
  • Information recording and reproducing apparatus, and information recording and erasing method

Examples

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1st embodiment

[0059] (1st Embodiment)

[0060] First, the method of erasing data according to the first embodiment of the present invention will be explained with reference to FIG. 3. FIG. 3 shows a data configuration of the optical disc 100 on which the recorded file is recorded with the erasing option set to the ON state by the above-mentioned data recording method.

[0061] Namely, as shown in FIG. 3, the key file 105 and the encrypted data 106 are separately recorded in the data area 104. The information indicating whether the erasing option of the recorded file is set to the ON state or the OFF state can be recorded in the file management information area 103, for example. As explained above, the key file 105 is configured by the key portion 105A and the address obtaining data 105B.

[0062] In the embodiment, when the recorded file which is recorded by the above-mentioned method with setting the erasing option to the ON state is erased, only the key portion 105A in the key file 105 is overwritten,...

2nd embodiment

[0072] (2nd Embodiment)

[0073] A method of erasing data according to the second embodiment of the present invention will be explained with reference to FIG. 4. In the second embodiment, the information recording and reproducing apparatus 300 is adopted to a defect management system. The second embodiment is different from the first embodiment in that the file is erased by the method utilizing defect management system.

[0074]FIG. 4 shows a data structure of the optical disc 100 recorded with the erasing option set to the ON state by the above-mentioned recording method. The optical disc l00 includes the lead-in area 101, the lead-out area 102, the file management information area 103, and the data area 104, as shown in FIG. 4. In addition, in the present embodiment, the optical disc 100 further includes a defect management information area 107.

[0075] The left side in FIG. 4 is the inside of the optical disc 100, and the right side is the outside of the optical disc 100. The lead-in a...

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Abstract

When data is recorded on an optical disc capable of recording information only once, such as a DVD-R and the like, encrypted data obtained by encrypting the recording data and a key for decrypting the encrypted data are generated, and they are recorded in different areas on the recording medium. When the data recorded by the recording method is erased, only a key portion in a file including the key for decrypting the encrypted data is physically made a defect, or is registered as the defect by a defect management system. Thereby, since the key portion becomes unreadable, it becomes impossible that the recording data is restored by decrypting the encrypted data. Therefore, the recording data can be substantially completely erased.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a method of recording information on a recording medium and erasing the recorded information. [0003] 2. Description of Related Art [0004] There is known an information recording and reproducing apparatus capable of recording information on an optical disc, such as a DVD-R / RW and the like, and capable of reproducing and erasing the recorded information. So far, additional recording was performed by a method, such as a UDF (Universal Disk Format) and a multi-session, as for an additionaly-recordable-type recording medium capable of recording information only once, like a DVD-R. In the method, when the recorded information is erased, newest file management information is wholly utilized by additionally recording changed file management information in a new area while a last file management information area is left as it is (see Japanese Patent Application Laid-open under No. 2002-324383...

Claims

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Application Information

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IPC IPC(8): G11B7/0055G11B20/00G11B20/10G11B20/12G11B20/18
CPCG11B20/00086G11B20/0021G11B2220/20G11B20/00927G11B20/1883G11B20/00282
Inventor KURODA, KAZUO
Owner PIONEER CORP
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